Simulation and Development of Unified Power Flow Controller Using Multilevel Inverter
Heavily loaded transmission lines and the inability to control the amount and direction of power flows have became major concerns to the power utilities. Some of the solutions taken by the power utilities are by expanding the size of power system network in terms of building new transmission line...
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my-upm-ir.78472013-05-27T07:36:48Z Simulation and Development of Unified Power Flow Controller Using Multilevel Inverter 2010 Mailah, Nashiren Farzilah Heavily loaded transmission lines and the inability to control the amount and direction of power flows have became major concerns to the power utilities. Some of the solutions taken by the power utilities are by expanding the size of power system network in terms of building new transmission lines, using higher rating equipments and installing more generating units. The power utilities also have improved the transmission lines capability and better utilizing of existing power system networks. The power flows in the transmission lines in accordance to their series impedance, voltage magnitude at the sending end and receiving end, and phase angle between these two voltage ends. Electromechanically controlled devices have been used to control the power flow which is now steadily being replaced with static devices. The problem with these electromechanically controlled devices is sometimes they do not react fast enough especially during disturbances. Furthermore, they are subjected to wear and tear which requires regular monitoring and servicing. The advancement in power electronics devices, which provide faster response compared to the electromechanical ones and require less maintenance as they do not wear and tear easily has attracted great interest from the researchers. Among these power electronics devices, Unified Power Flow Controller (UPFC) has gained a lot of attention due to its ability to control, simultaneously or selectively, all the three of power system parameters i.e. line impedance, voltage magnitude and phase angle. In this work, UPFC’s simulation model has been designed and developed as a power system device to investigate the behaviour of the system under normal and abnormal conditions. A small-scale laboratory model has also been constructed to validate the findings obtained from the simulation model. To avoid high frequency components produced in Pulse Width Modulation (PWM), a 3-level Neutral Point Clamped (NPC) multilevel inverter has been proposed as the series inverter for the UPFC using Space Vector Modulation (SVM). The shunt inverter for UPFC is composed of a 6-pulse diode bridge rectifier and a line commutating thyristor bridge. A triggering circuit for the simulation model for the SSSC has been improved for Matlab/Simulink module. For the laboratory model, a switching circuit consists of PIC, optocouplers, IGBTs drivers and monostable multivibrators has been successfully constructed. The proposed 3-level NPC inverter has been shown to have a better feature in terms of Total Harmonics Distortion (THD) with a simulation value of 13.36% VLL and experimental value of 15.65% VLL. The THD value is lower compared to a similar work of 16.46%. The additional voltage phase shift, φ produced by the SSSC has been shown to affect the phase shift between the sending end voltage and receiving end voltage. As the line impedance and both voltages are usually constant, any variation in phase shift between the two voltages will affect the amount of power flows in the transmission lines and its direction. The THDs of the voltage and current of the SSSC when connected between two busbars have been determined and a good agreement between the simulation and laboratory results has been achieved. From the simulation, the THD value of line voltage is approximately 1.3% which is lower compared to other work of 2.49% and 3.58%. A comprehensive controllable UPFC using real power transfer algorithm and reactive power compensation algorithm has been successfully designed and constructed as a simulation model that is able to stabilize voltage with required power for fast changing loads. 2010 Thesis http://psasir.upm.edu.my/id/eprint/7847/ http://psasir.upm.edu.my/id/eprint/7847/1/ABS_%3D%3D%3D__FK_2010_1.pdf application/pdf en public phd doctoral Universiti Putra Malaysia Faculty : Engineering English |
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Mailah, Nashiren Farzilah Simulation and Development of Unified Power Flow Controller Using Multilevel Inverter |
| description |
Heavily loaded transmission lines and the inability to control the amount and
direction of power flows have became major concerns to the power utilities. Some of
the solutions taken by the power utilities are by expanding the size of power system
network in terms of building new transmission lines, using higher rating equipments
and installing more generating units. The power utilities also have improved the
transmission lines capability and better utilizing of existing power system networks.
The power flows in the transmission lines in accordance to their series impedance,
voltage magnitude at the sending end and receiving end, and phase angle between
these two voltage ends. Electromechanically controlled devices have been used to
control the power flow which is now steadily being replaced with static devices. The
problem with these electromechanically controlled devices is sometimes they do not
react fast enough especially during disturbances. Furthermore, they are subjected to
wear and tear which requires regular monitoring and servicing. The advancement in power electronics devices, which provide faster response
compared to the electromechanical ones and require less maintenance as they do not
wear and tear easily has attracted great interest from the researchers. Among these
power electronics devices, Unified Power Flow Controller (UPFC) has gained a lot
of attention due to its ability to control, simultaneously or selectively, all the three of
power system parameters i.e. line impedance, voltage magnitude and phase angle.
In this work, UPFC’s simulation model has been designed and developed as a power
system device to investigate the behaviour of the system under normal and abnormal
conditions. A small-scale laboratory model has also been constructed to validate the
findings obtained from the simulation model. To avoid high frequency components
produced in Pulse Width Modulation (PWM), a 3-level Neutral Point Clamped
(NPC) multilevel inverter has been proposed as the series inverter for the UPFC
using Space Vector Modulation (SVM). The shunt inverter for UPFC is composed of
a 6-pulse diode bridge rectifier and a line commutating thyristor bridge. A triggering
circuit for the simulation model for the SSSC has been improved for
Matlab/Simulink module. For the laboratory model, a switching circuit consists of
PIC, optocouplers, IGBTs drivers and monostable multivibrators has been
successfully constructed.
The proposed 3-level NPC inverter has been shown to have a better feature in terms
of Total Harmonics Distortion (THD) with a simulation value of 13.36% VLL and
experimental value of 15.65% VLL. The THD value is lower compared to a similar
work of 16.46%. The additional voltage phase shift, φ produced by the SSSC has been shown to affect
the phase shift between the sending end voltage and receiving end voltage. As the
line impedance and both voltages are usually constant, any variation in phase shift
between the two voltages will affect the amount of power flows in the transmission
lines and its direction. The THDs of the voltage and current of the SSSC when
connected between two busbars have been determined and a good agreement
between the simulation and laboratory results has been achieved. From the
simulation, the THD value of line voltage is approximately 1.3% which is lower
compared to other work of 2.49% and 3.58%.
A comprehensive controllable UPFC using real power transfer algorithm and
reactive power compensation algorithm has been successfully designed and
constructed as a simulation model that is able to stabilize voltage with required
power for fast changing loads. |
| format |
Thesis |
| qualification_name |
Doctor of Philosophy (PhD.) |
| qualification_level |
Doctorate |
| author |
Mailah, Nashiren Farzilah |
| author_facet |
Mailah, Nashiren Farzilah |
| author_sort |
Mailah, Nashiren Farzilah |
| title |
Simulation and Development of Unified Power Flow Controller Using Multilevel Inverter |
| title_short |
Simulation and Development of Unified Power Flow Controller Using Multilevel Inverter |
| title_full |
Simulation and Development of Unified Power Flow Controller Using Multilevel Inverter |
| title_fullStr |
Simulation and Development of Unified Power Flow Controller Using Multilevel Inverter |
| title_full_unstemmed |
Simulation and Development of Unified Power Flow Controller Using Multilevel Inverter |
| title_sort |
simulation and development of unified power flow controller using multilevel inverter |
| granting_institution |
Universiti Putra Malaysia |
| granting_department |
Faculty : Engineering |
| publishDate |
2010 |
| url |
http://psasir.upm.edu.my/id/eprint/7847/1/ABS_%3D%3D%3D__FK_2010_1.pdf |
| _version_ |
1747810718793596928 |